/*
 * Copyright 2021 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.felord.common.kogito.dmn;


import cn.felord.common.exception.ServiceException;
import org.kie.dmn.api.core.DMNContext;
import org.kie.dmn.api.core.DMNModel;
import org.kie.dmn.api.core.DMNResult;
import org.kie.dmn.api.core.DMNRuntime;
import org.kie.dmn.core.api.DMNFactory;
import org.kie.dmn.core.internal.utils.DynamicDMNContextBuilder;
import org.kie.kogito.KogitoGAV;
import org.kie.kogito.decision.DecisionModel;
import org.kie.kogito.decision.DecisionModels;
import org.kie.kogito.dmn.DmnDecisionModel;

import java.util.Map;
import java.util.function.BiFunction;

/**
 * The type Simple decision models.
 */
public class SimpleDecisionModels implements DecisionModels {

    private final DMNRuntime dmnRuntime;
    private final BiFunction<DecisionModel, KogitoGAV, DecisionModel> decisionModelTransformer;
    private final KogitoGAV gav;


    /**
     * Instantiates a new Simple decision models.
     *
     * @param dmnRuntime the dmn runtime
     */
    public SimpleDecisionModels(DMNRuntime dmnRuntime) {
        this(dmnRuntime, (decisionModel, kogitoGAV) -> decisionModel);
    }

    /**
     * Instantiates a new Simple decision models.
     *
     * @param dmnRuntime               the dmn runtime
     * @param decisionModelTransformer the decision model transformer
     */
    public SimpleDecisionModels(DMNRuntime dmnRuntime, BiFunction<DecisionModel, KogitoGAV, DecisionModel> decisionModelTransformer) {
        this(dmnRuntime, KogitoGAV.EMPTY_GAV, decisionModelTransformer);
    }

    /**
     * Instantiates a new Simple decision models.
     *
     * @param dmnRuntime the dmn runtime
     * @param gav        the gav
     */
    public SimpleDecisionModels(DMNRuntime dmnRuntime, KogitoGAV gav) {
        this(dmnRuntime, gav, (decisionModel, kogitoGAV) -> decisionModel);
    }

    /**
     * Instantiates a new Simple decision models.
     *
     * @param dmnRuntime               the dmn runtime
     * @param gav                      the gav
     * @param decisionModelTransformer the decision model transformer
     */
    public SimpleDecisionModels(DMNRuntime dmnRuntime,
                                KogitoGAV gav,
                                BiFunction<DecisionModel, KogitoGAV, DecisionModel> decisionModelTransformer) {
        if (dmnRuntime == null) {
            throw new IllegalArgumentException("dmnRuntime is null");
        }
        if (gav == null) {
            throw new IllegalArgumentException("gav is null");
        }
        if (decisionModelTransformer == null) {
            throw new IllegalArgumentException("decisionModelTransformer is null");
        }
        this.dmnRuntime = dmnRuntime;
        this.gav = gav;
        this.decisionModelTransformer = decisionModelTransformer;
    }

    @Override
    public DecisionModel getDecisionModel(String namespace, String name) {
        try {
            DmnDecisionModel dmnDecisionModel = new DmnDecisionModel(dmnRuntime, namespace, name);
            return decisionModelTransformer.apply(dmnDecisionModel, gav);
        } catch (IllegalStateException e) {
            throw new ServiceException(700, "decision model not found", e);
        }
    }

    /**
     * Evaluate dmn result.
     *
     * @param model     the model
     * @param inputData the input data
     * @return the dmn result
     */
    public DMNResult evaluate(DMNModel model, Map<String, Object> inputData) {
        DynamicDMNContextBuilder contextBuilder = new DynamicDMNContextBuilder(DMNFactory.newContext() , model);
        DMNContext dmnContext = contextBuilder.populateContextWith(inputData);
        return this.dmnRuntime.evaluateAll(model, dmnContext);
    }
}
